Sewing machine presser mechanisms



April 1953. A. N. HALE SEWING MACHINE PRESSER MECHANISMS Fi led May 12, 1951 Original 2 Sheets-Sheet l \QXW m lwg INVENTOR flrthwr JV Hale WM 1 M r I m ATTORNEY WITNESS= AP)! 10, 1956 A. N. HALE 2,741,201

SEWING MACHINE PRESSER MECHANISMS Original Filed May 12, 1951 2 Sheets-Sheet 2 WITNESS= t5 MENTOR oqrthu/r BY ATTORNEY SEWING Mi term rnnssnn rvmcHANrsr/is Arthur N. Hale, Paris Ridge, 111., assignor to The Singer Manufacturing (Iornpany, Elizabeth, N. 3., a corporation of New Eersey Original application May 12, 1951, Serifl No. 2%,382. Divided and application duty 28, 1952, Serial No. 301,272

1 Claim. (Cl. 112-237) This invention relates to sewing machines and more particularly to a simplified presser mechanism therefor.

The invention has as its main object to provide a simplified presser mechanism of which the individual parts can be cheaply manufactured and readily assembled into an organized mechanism.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter described and particularly pointed out in the appended claim.

in the accompanying drawings:

Fi i is a vertical sectional view taken longitudinally of the frame of a sewing machine embodying the invention.

Fig. 2 is a left end elevation with the face-plate removed from the head and the cloth-plate, drip-pan and one of the resilient mountings in section.

Fig. 3 is a rear elevation of the bracket-arm and head of the machine, a portion of the bracket-arm being sectioned to illustrate the preferred method of supporting the inner end of the presser-bar lifter rod.

Fig. 4 represents a horizontal sectional view taken substantially along the line 44, Fig. 2.

The following detailed description has to do with the construction of the machine as it relates to the presser mechanism, and for a. more complete description of the entire machine reference may be had to my copending application Serial No. 226,082, filed May 12, 1951, of which this application is a division.

Referring more in detail to the drawings, the machine illustrated has a hollow machine-frame which is preferably cast in one piece and comprises a bed Hi from one end of which rises a standard 11 of an overhanging bracket-arm 12 terminating in a head 13.

The bed is transversely formed with depending endwalls 14 and 15 providing bearing supports for the opposite end of a mainor bed-shaft indicated generally as 16; intermediate the end-walls 14 and 15 is a depending transverse partition 17 providing a third bearing for the bed-shaft 16. Spanning the space betweenthe en wall 14 and the depending partition 17 is a horizontal wall 18 afiording the top of a lubrication compartment 19 closed at its bottom by a removable plate 26. The lubrication compartment 19 is in communication with the hollow 21 of the standard 11, whereby the oil-laden atmosphere created in the compartment 19 may lubricate the operating connections in the bed and standard. Adjacent the right hand end of the bracket-arm 12 there is provided a partition 22 separating the hollow of the bracket-arm 12 from the hollow of the standard 11 and supporting a rear bearing (not shown) for an arm-shaft 24. A front bearing 25 for the arm-shaft 24 in mounted in a partial partition 26 formed wthin the bracket-arm 12 at the point where it merges into the head 13 of the machine. A sheet-metal face-plate 27 closes the head 13 against ingress of dirt and lint and confines any spent lubricant within the head. To facilitate assembly of 2,741,201 Patented Apr. 10, 1956 the mechanism within the bracket-arm 12 an access opening 28 is formed in the upper end of the standard and a detachable cover-plate 29 is provided to close said access opening.

Mounted on the bed 19 is a suitable cloth-plate 30 to which is secured a throat-plate 31. The entire mais preferably yieldingly supported on four resilient cushions 32 housed at their upper ends in apertured pads 33 cast integral with the machine-bed 1%. Each of the resilient cushions 32 is bored, as at 34, to receive a locating sleeve 35 brazed or otherwise secured to a s' eet-metal box-like drip-pan 36. Each of the locating sleeves 3:3 has a wood-screw 37 projecting through it to secure the drip-pan to a conventional table structure 33. it will be appreciated that the locating sleeves 35 position the machine within the drip-pan 36 which it attached to the table-top 33, and that the machine can be readily removed from the drip-pan by simply lifting the machine and the resiiieit cushions 32 0d the locating sleeves 3'5.

The main-shaft, which is journaled for rotation in the bed 1%, comprises a front section 39 and a relatively shorter rear section d3; the proximate ends of the sections 3? and 43 comprising an articulated crank having separaole components. The front section 39 is journaled in the plain hushed bearings 41 and 4-2 disposed in the and 37, respectively, of the bed 19. The shaft section 39 is tubular, having a longitudinal bore 43 a maior portion of its length, and adjacent its front is formed with a feed-advance eccentric i4 t eccentric i5.

Carrie" 0} the front end of the shaft-section 39 is aconventional form of wing-type looper es. Brazed or' otherwise secured on the reduced rear end portion of the shaft-section 3?? is a counterbalanced disk-shapecl' crankcheek 47 forming one component of the articulated craniz; the crank-cheek being formed in its end face with a radially extending notch and having its periphery d9 cut eccentrically of the axis of rotation of the shaftsection 39, thereby to provide an eccentric for actuating, a thread-nipper ?rojecting into the radiall" extending. notch as in the crank-cheek d? is the rednced outer end of a crank-pin 53 brazed or otherwise secured in a second counterbalanced dislr-like crank-cheek 52 suitably fastened on the rear shaft-section 4%. Aswill be seen in Fig 1, the rear shaft-section it? is iournaled' in ball-bearings 53' and 54 mounted in spaced relation in a sleeve 55' adapted to be replaceably mounted in a shaft assembly aperture 55 formed in the wall 15 of the bed, Mounted on the exposed end of the rear shaft section is a combination handwheel and belt-pulley 57. For assembly pur oses, the aperture 56 is sized to exceed slightly the diameter craniacheek 52. so that the ci'anlL che-ek 52; with its crankpin 53, shaft 49, bail-bearings 53 and 5d, sleeve; 55 and hand-wheel 5''! can be assembled as a unit outside the machine and inserted through the aperture 5'. A setscrew 58 looks the unit in place and a conventional resilient ring-gasket 59 prevents escape of the oil in the lubrication compartment 19-21 outwardly along the surface of the aperture 5s.

Cooperating with the wing-type looper 46 in the formation of single thread chain-stitches is a thread-carrying needle 6% carried in the lower end of an endwise reciprocatory needle-bar 61 journaled in bearing-bushings 62 and as fixed in the machine heat 13-. Clamped on the needle-bar n1 is a stud 64 embraced by the lower end of a needle-bar actuating link 65 which is connected at its upper end to a rock-arm 66 clamped on the arm-shaft 24. Rocking movements are imparted to the arm-shaft 24 by means of a rock-arm 65' preferably pinned or otherwise fastened on the standard end of the arm-shaft of the 3 24; the rock-arm 65 having connected to its free end the upper endtof a driving link 68 embracing at its lower end the crank-pin 51 on the rotary bed-shaft 16.

The work is advanced past the stitching devices by means of a lower four-motion feeding mechanism having the usual feed-dog 69 which operates through suitable slots provided in the throat-plate 31. The feed-dog 69 derives its rising and falling movements from the feedlift eccentric 45 and its feed-advance and return movements from the feed-advance eccentric 44 in a manner fully disclosed in my above mentioned eppiic ion Serial No. 226,082.

Opposing the feed-dog 69 is a resser-foot 7t) carried onthe lower end of a vertically disposed presser-bar 71 endwise slidably mounted in the head 13. Surrounding the upper portion of the presser-bar 71 is a coil-spring 72 which biases the resser-foot 70 downwardly into work-clamping relationship by reacting at its upper end against a cap-screw 73 adjustably threaded in the machinehead 13 and centrally bored to provide the upper hearing for the resser-bar 71. At its lower end the coilspring 72 engages a resser-bar guiding and lifting bracket 74 clamped by a set screw 75 in selected position on the resser-bar 71. As shown in Fig. 4, the bracket 74 guides or, in other words, prevents the resser-bar 71 from turning in its bearings by being formed with a guide-lug 76 which rides in a guideway 77 milled in the machine head 13. Projecting rearwardly from the bracket 74 is a lifting extension 78 disposed vertically above the usual pivotally mounted hand-lifting cam-lever 79. Manual raising of the hand-lifting cam-lever 79 will cause it to engage the lifting extension 78 and thereby raise the presser-foot 70 against the action of the coil-spring 72. Lowering of the cam-lever 79 will permit the spring 72 to return the presser-foot 70 to its lowered work-clamping 7 position. a

Means is provided for raisingthe resser-foot 70 by knee-shift or foot-treadle. This means comprises a lifting rock-arm 80 secured, as by brazing, to one end of a resser-lifting rock-shaft 81 located rearwardly of the bracket-arm 12 and journaled in spaced bearings 82 and 83 provided in the bracket-arm. The free end of the lift ing rock-arm 80 is offset or bent at right angles, as at 84 (Fig. 4), to extend into a vertical open-bottom'slot 85 formed in the lifting extensionr78. Oscillation of the lifting rock-arm 80 will cause its olfset end 84 to contact the lifting extension 78 and thus elevate the presser-foot 70. The slot 85 is open at its bottom to permit the handlifting lever 79 to be manually raised to elevate the resser-foot without causing movement of the lifting rock arm 80. The resser-lifting rock-shaft 81 has secured on it, by set-screw 86 (Fig. 3), a rearwardly extending actuating lever 87 suitably connected to a knee-shift or foot treadle not shown. A spring 88 acting between the lever 87 and the bracket-arm normally elevates the lever 87 and maintains'the lifting rock-arm 80 in engagement with a stop-pin 89 (Fig. 2).

As will be seen in Fig. 3, the bearing 83 for the resser- 4 lifting rock-shaft 81 is preferably drilled directly into the bracket-arm Wall and the inner end of the presserlifting rock-shaft is retained in this hearing holeby the fact that the lifting rock-arm 8% (Fig. 4) is confined between the lifting extension 73 and a flat face or surface machined on the end-face of the machine-head 13 in substantial parallelism with theproximate face of the lifting extension 78. As will be seen in Fig. 4, the guidelug 76 on the lifting bracket 74 maintains the presserbar 71 against turning in its bearings and, at the same time, anchors the lifting extension'78 so that it confines the lifting rock-arm 80 and thereby prevents endwise displacement of the rock-shaft 81.

From the foregoing it will be appreciated that the presser mechanism comprises relatively few parts which can be readily assembled and secured in proper assembled relation by two set screws and 86. 7

With the exception of the feeding mechanism, which is preferably fitted with oil impregnated sintered metal bushings and therefore requires very infrequent lubrication, the mechanisms of this machine are automatically lubricated by means of a splash system. The exact mannet in which the entire machine is preferably lubricated is fully described in one of my copending applications and reference may be had to that case for a complete disclosure of said system. I

Having thus set forth the nature of the invention, what I claim herein is:

A presser-mechanism for a sewing machine having a bracket-arm head provided with a fiat face and a guideway comprising, a resser-foot, a presser-bar carrying said presser-foot and journaled for endwise sliding movement in said bracket-arm head, a spring for biasing said presserfoot' downwardly, a guide bracket detachably fixed on said resser-bar and provided with a guide lug disposed in said guideway to prevent accidental turning of said resser-bar, a lifting extension mounted on said guidebracket and projecting laterally therefrom and having a flat side-surface disposed substantially parallel to and spaced from said flat face in overlapping opposed relation defining a guide slot, said lifting extension also having an elongated opening formed in it, manually operated means for raising said presser-foot including a presser-lifting rockshaft journaled in said bracketearm head, and a lifting rock-arm mounted at one end on said resser-lifting rock-shaft and at its other end having a portion thereof extending into said elongated opening in said lifting extension to raise said presser-bar when said rock-shaft is actuated, said rock-arm extending into said guide slot thereby to limit endwise movement of said presser-lifting rock-shaft.

References Cited in the file of this patent UNITED STATES PATENTS 7 1,313,265 Corrall Aug. 19, 1919 FOREIGN PATENTS 199,260 Switzerland Aug. 15, 1938 

